Hi i'm having problems with Fenics 1.4.0, my code was working with the previous version. I have this error and I have no idea what is the problem, can you help? Here is the error. Thank you.
Traceback (most recent call last):
File "robin.py", line 594, in
LV = assemble(L)
File "/usr/site-local/FEniCS-1.4.0/lib64/python2.7/site-packages/dolfin/fem/assembling.py", line 230, in assemble
cell_domains, exterior_facet_domains, interior_facet_domains)
File "/usr/site-local/FEniCS-1.4.0/lib64/python2.7/site-packages/dolfin/fem/assembling.py", line 80, in _create_dolfin_form
mesh=mesh)
File "/usr/site-local/FEniCS-1.4.0/lib64/python2.7/site-packages/dolfin/fem/form.py", line 98, in init
= jit(form, form_compiler_parameters)
File "/usr/site-local/FEniCS-1.4.0/lib64/python2.7/site-packages/dolfin/compilemodules/jit.py", line 62, in mpi_jit
return local_jit(*args, **kwargs)
File "/usr/site-local/FEniCS-1.4.0/lib64/python2.7/site-packages/dolfin/compilemodules/jit.py", line 126, in jit
return jit_compile(form, parameters=p)
File "/usr/site-local/FEniCS-1.4.0/lib64/python2.7/site-packages/ffc/jitcompiler.py", line 77, in jit
return jit_form(ufl_object, parameters)
File "/usr/site-local/FEniCS-1.4.0/lib64/python2.7/site-packages/ffc/jitcompiler.py", line 103, in jit_form
form_data = form.compute_form_data()
File "/usr/site-local/FEniCS-1.4.0/lib/python2.7/site-packages/ufl/form.py", line 169, in compute_form_data
self._form_data = preprocess(self, object_names=object_names)
File "/usr/site-local/FEniCS-1.4.0/lib/python2.7/site-packages/ufl/algorithms/preprocess.py", line 149, in preprocess
form_data.subdomain_data = join_subdomain_data(form.integrals(), form.domains())
File "/usr/site-local/FEniCS-1.4.0/lib/python2.7/site-packages/ufl/algorithms/preprocess.py", line 98, in join_subdomain_data
l = l2l[None]
KeyError: None